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<h3>Remove or Change Data</h3>

<p>Removing and changing data is based on reading a database
<i>after</i> all other databases.</p>

<p>The order in which databases are
searched can be changed using the pull-down menu
&#147;Options / Data / <nobr>Database&nbsp;files&#148;.</nobr>
The order is important because for two species with the same name
(but different <nobr>log<i>K</i>&deg;</nobr> value),
only the last one will be retained.</p>

<p><b>Single User</b>
(when there is a copy of DATABASE/SPANA installed on <i>your</i> computer):</p>
<ul>
<li>change a logK-value by entering the new value using the menu
	&#147;Options / Data / <nobr>Add&nbsp;data!&#148;.</nobr>
	The the logK-file <nobr><tt>New-Data.txt</tt></nobr> and the element-file
	<nobr><tt>New-Data.elm</tt></nobr> are then created and these files
	are read after the binary database supplied with DATABASE. For two species
	with the same name (but different <nobr>log<i>K</i>&deg;</nobr> value),
	only the last one read will be retained.</li>

<li>remove components from the list for an element by adding a new component
	with the same name but preceeding the name with a <nobr>&#147;<tt>@</tt>&#148;</nobr>
	(in menu &#147;Options / Data / <nobr>Add&nbsp;data!&#148;).</nobr>
	For example, adding <nobr>&#147;<tt>@Fe</tt>&nbsp;<tt>2+</tt>&#148;</nobr>
	linked to <nobr>&#147;Fe&#148;</nobr> removes <nobr>Fe(II)</nobr> from the
	components available for iron.</li>

<li>remove reactions by adding a new species with the same name but inserting
	a <nobr>&#147;<tt>@</tt>&#148;</nobr> at the beginning of the name.
	For example, to remove the species <nobr>&#147;<tt>FeOH</tt>&nbsp;<tt>2+</tt>&#148;</nobr>
	just add a species named <nobr>&#147;<tt>@FeOH</tt>&nbsp;<tt>2+</tt>&#148;.</nobr>
	The <nobr>log<i>K</i>&deg;</nobr> value is not used, because the species will be removed.</li>
</ul>

<p><a name="Network"></a>
<b>Running on a Network server:</b></p>
<ul>
<li>Each user may change or remove data as indicated above.
	The database New-Data is then saved on a user directory.</li>
<li>To make collective changes and deletions of data if DATABASE has been
  installed on a network server and all users run the same
	<tt>EXE</tt>-file: Create the database New-Data as indicated above for a single user.
	These files <nobr>(<tt>New-Data.elm</tt></nobr>&nbsp; and&nbsp; <nobr><tt>New-Data.txt</tt>)</nobr>
	are then copied to the directory where <nobr><tt>Database.exe</tt></nobr> is located,
	and they are renamed to <nobr><tt>Hydr-New.elm</tt></nobr>&nbsp; and&nbsp;
  <nobr><tt>Hydr-New.txt</tt>.</nobr>
	The data are then automatically used by all users.</li>
<li>If an <nobr>&#147;ini&#148;-</nobr>file <nobr>(<tt>Database.ini</tt>)</nobr>
  is found in the	installation directory
  (that is, where <nobr><tt>Database.exe</tt></nobr>	is found) then this file
  is always used to read dabase names and other options. If this file is
  read-only, then the user&rsquo;s <nobr>&#147;ini&#148;-</nobr>file
  (in <nobr><tt><b>%APPDATA%</b></tt>)</nobr>	then supplies only the default
  directory. See also <a href="1_Install_Uninstall.htm">
  Installing and <nobr>Uninstalling</a>.</nobr></li>
</ul>

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